Characterization of the Active Surface Species Responsible for UV-Induced Desorption of O2 from the Rutile TiO2(110) Surface

2013 ◽  
Vol 117 (11) ◽  
pp. 5774-5784 ◽  
Author(s):  
Michael A. Henderson ◽  
Mingmin Shen ◽  
Zhi-Tao Wang ◽  
Igor Lyubinetsky
Keyword(s):  
Active Surface ◽  
Surface Species ◽  
Rutile Tio2

scholarly journals Characterization of individual molecular adsorption geometries by atomic force microscopy: Cu-TCPP on rutile TiO2 (110)

2015 ◽  
Vol 143 (9) ◽  
pp. 094202 ◽  
Author(s):  
Res Jöhr ◽  
Antoine Hinaut ◽  
Rémy Pawlak ◽  
Ali Sadeghi ◽  
Santanu Saha ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Molecular Adsorption ◽  
Rutile Tio2 ◽  
Force Microscopy ◽  
Atomic Force

Operando NAP-XPS Observation and Kinetics Analysis of NO Reduction over Rh(111) Surface: Characterization of Active Surface and Reactive Species

ACS Catalysis ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 11663-11670 ◽  
Author(s):  
Kohei Ueda ◽  
Kazuhisa Isegawa ◽  
Kenta Amemiya ◽  
Kazuhiko Mase ◽  
Hiroshi Kondoh
Keyword(s):  
Surface Characterization ◽  
No Reduction ◽  
Active Surface ◽  
Reactive Species ◽  
Kinetics Analysis

scholarly journals Progress in the Characterization of the Surface Species in Activated Carbons by means of INS Spectroscopy Coupled with Detailed DFT Calculations

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Andrea Piovano ◽  
Andrea Lazzarini ◽  
Riccardo Pellegrini ◽  
Giuseppe Leofanti ◽  
Giovanni Agostini ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Activated Carbons ◽  
Inelastic Neutron ◽  
Industrial Applications ◽  
Surface Species ◽  
Dft Methods ◽  
Neutron Spectra ◽  
Out Of Plane ◽  
Bending Modes

Activated carbons are materials with relevance in different industrial applications. Due to the inherent complexity and heterogeneity of their structures, an easy assignment of the species present on their surface has a challenging result. Only recently, with the possibility to collect well-resolved inelastic neutron spectra and to simulate by DFT methods more or less extended graphitic clusters, this task is starting to become feasible. Here we report our investigation on a steam activated carbon and we show that different vibrations in the region of out-of-plane C-H bending modes are specifically connected to hydrogen terminations belonging to extended and regular borders or to short and defective ones. Furthermore, simulations including heteroatoms such as oxygen allowed us to point out spectral regions with a contribution from carboxyl species.

Preparation and Characterization of TiO2 Nanostructures for Catalytic CO2 Photoconversion

2011 ◽  
Vol 183 ◽  
pp. 89-94 ◽  
Author(s):  
Anna Iwulska ◽  
G. Sliwinski
Keyword(s):  
Active Surface ◽  
Laser Pulses ◽  
Point Of View ◽  
Deep Penetration ◽  
Spectroscopic Techniques ◽  
X Ray Diffraction ◽  
X Ray ◽  
Content Ratio ◽  
Photocatalytic Applications

The titanium dioxide target (99.7%) of 1 cm in dia was ablated in vacuum by laser pulses (6 ns) at 266 nm and at repetition rate of 10 Hz. During deposition the laser fluence between 1 and 3.5 J/cm2 and the O2 pressure from the range of 10-2 – 1 Pa were applied. The thin TiO2 films were deposited on glass substrate (1 × 1 cm2) heated up to 500 °C. The chemical composition of the film and samples produced by annealing were investigated by spectroscopic techniques (μ-Raman, EDX) and the structure, porosity and surface morphology were analysed by means of SEM and x-ray diffraction (XRD). The SEM inspection of the TiO2 thin film samples indicates that the obtained material is mostly crystalline. After annealing in O2 at 500 °C the structure characterized by the presence of both anatase and rutile phases is observed in the Raman spectra and confirmed by the XRD data. The phase content ratio depends on the O2 pressure applied. Results confirm that nanostructures produced in this way represent densely packed columns and promote deep penetration of guest particles such as CO2.The resulting large active surface is advantageous from the point of view of photocatalytic applications.

New insight into the roles of oxygen vacancies in hematite for solar water splitting

2017 ◽  
Vol 19 (2) ◽  
pp. 1074-1082 ◽  
Author(s):  
Xin Zhao ◽  
Jianyong Feng ◽  
Shi Chen ◽  
Yizhong Huang ◽  
Tze Chien Sum ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Water Splitting ◽  
Oxygen Vacancies ◽  
Active Surface ◽  
Transfer Efficiency ◽  
Surface Species ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Insight Into

Oxygen vacancies have different impacts on the charge transfer efficiency of pristine and Ti-doped hematite through active surface species.

scholarly journals The WeIzmann Supercooled Droplets Observation on a Microarray (WISDOM) and application for ambient dust

2018 ◽  
Vol 11 (1) ◽  
pp. 233-248 ◽  
Author(s):  
Naama Reicher ◽  
Lior Segev ◽  
Yinon Rudich
Keyword(s):  
Active Surface ◽  
Ice Nucleation ◽  
Saharan Dust ◽  
Dust Particles ◽  
Active Surface Site ◽  
Immersion Freezing ◽  
Measurement Uncertainties ◽  
Homogeneous Freezing ◽  
Validation Experiments

Abstract. The WeIzmann Supercooled Droplets Observation on Microarray (WISDOM) is a new setup for studying ice nucleation in an array of monodisperse droplets for atmospheric implications. WISDOM combines microfluidics techniques for droplets production and a cryo-optic stage for observation and characterization of freezing events of individual droplets. This setup is designed to explore heterogeneous ice nucleation in the immersion freezing mode, down to the homogeneous freezing of water (235 K) in various cooling rates (typically 0.1–10 K min−1). It can also be used for studying homogeneous freezing of aqueous solutions in colder temperatures. Frozen fraction, ice nucleation active surface site densities and freezing kinetics can be obtained from WISDOM measurements for hundreds of individual droplets in a single freezing experiment. Calibration experiments using eutectic solutions and previously studied materials are described. WISDOM also allows repeatable cycles of cooling and heating for the same array of droplets. This paper describes the WISDOM setup, its temperature calibration, validation experiments and measurement uncertainties. Finally, application of WISDOM to study the ice nucleating particle (INP) properties of size-selected ambient Saharan dust particles is presented.

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